]give a proof by contradiction: let g be any directed graph in which every pair of nodes u and v has exactly one edge (either uv or u v but not both), and let w be a node with highest out-degree. then every node is reachable from w by a path of length 3 2.

Which action describes an aspect of technological design?

Match the personality traits with their description

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?